21101144 has 16 divisors (see below), whose sum is σ = 39714720. Its totient is φ = 10510560.

The previous prime is 21101123. The next prime is 21101207. The reversal of 21101144 is 44110112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2699 + ... + 7034.

It is an arithmetic number, because the mean of its divisors is an integer number (2482170).

Almost surely, 2^21101144 is an apocalyptic number.

It is an amenable number.

21101144 is a deficient number, since it is larger than the sum of its proper divisors (18613576).

21101144 is a wasteful number, since it uses less digits than its factorization.

21101144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010 (or 10006 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 21101144 is about 4593.5981539530. The cubic root of 21101144 is about 276.3346427497.

Adding to 21101144 its reverse (44110112), we get a palindrome (65211256).

The spelling of 21101144 in words is "twenty-one million, one hundred one thousand, one hundred forty-four".